Switch Products

SendX

Email software to send campaigns, build lists, and automate marketing

Current

SendPost

Reach your customers' inboxes on time, every time with Email API + SMTP Relay

Features

View all Features

Addons

Franchise Support Custom Reply Bot Open/Click Tracker Read, Skimmed And Glanced Shortcuts Dynamic Sender View all Addons

Powered by SendPost

SendPost Dashboard
SendPost SendPost

AI-powered deliverability engine that ensures your emails land in the inbox.

Explore SendPost

Creators & Media

Newsletters Publishers Authors & Bloggers

Business

Ecommerce SaaS Local Businesses

Gaming

Casinos iGaming

Learn

Email Strategy Email Deliverability Email Automation Email Design Email List Building Newsletters

Compare

Tools & Pricing Case Studies Blog Guides

Developers

SendX API Docs SendPost API Docs Knowledge Base
Pricing
Ask AI
Log In Book a demo Try it free
Back to Blog

Email Deliverability

Everything you need to land in the inbox — from authentication (SPF, DKIM, DMARC) to domain reputation, warmup, and avoiding spam filters.

Article header showing
Latest

Best Transactional Email API for SaaS: Pricing & Features Compared [2026]

Choosing the wrong transactional email API costs more than money — it costs deliverability. This guide compares SendPost, Mailtrap, Mailgun, Amazon...

Grant Hatfield May 20, 2026

Best Transactional Email API for SaaS: Pricing & Features Compared [2026]

Choosing the wrong transactional email API costs more than money — it costs deliverability. This guide compares SendPost, Mailtrap, Mailgun, Amazon SES, and Postmark across pricing, inbox placement...

Grant Hatfield
May 20th, 2026

How I Got 97% Deliverability on a Domain Google Had Already Written Off

Joshua Waldman
March 18th, 2026

When ESPs Hide Deliverability Data, These Are the Signals Brands Lose First

A woman with dark hair, wearing a red shirt, holds a white flower with five petals near her face, smiling and looking to the side. Green leaves and a tree trunk are visible in the background.
Priya Nain
February 10th, 2026

Why Blasting Emails Lowers Deliverability And How To Avoid It

In this blog, we’ll break down why blasting huge volumes of emails at once almost always backfires, what actually happens behind the scenes when inbox providers see that surge, and how spreading ou...

Trevor Hatfield
September 9th, 2025

How to Handle and Identify Spam Traps: A Comprehensive Guide

In email marketing, one challenge looms large: spam traps. These innocuous-looking email addresses can wreak havoc on your sender reputation and email deliverability if left unchecked. But fear not...

Saitej Makhijani
December 6th, 2024

How to Warm Up Your Domain: A Step-by-Step Guide for Better Email Deliverability

Email remains one of the most powerful tools in a marketer’s arsenal. But its effectiveness hinges on one crucial factor: deliverability. You may craft the perfect email campaign, but if your messa...

Shahnawaz Mohammed
December 2nd, 2024

How to Fix Deliverability on Platforms (Yahoo, Google, etc.)

In email marketing, getting your message into recipients' inboxes is half the battle – and often the toughest half. Savvy marketers know that deliverability isn't just important; it's the bedrock u...

Saitej Makhijani
November 22nd, 2024

Top 10 Inbox Test Tools

Email clients render messages differently—what looks perfect in Gmail might appear broken in Outlook. Each incorrect rendering, spam filter trigger, or deliverability issue diminishes your campaign...

Shahnawaz Mohammed
November 22nd, 2024

Top 8 Tools for Domain Warm-up to Boost Email Deliverability Instantly

Believe it or not, email deliverability can make or break your marketing success. Think of domain warm-up tools as the key to building trust with email service providers. Email warm-up is not just ...

Shahnawaz Mohammed
November 20th, 2024

IP Warmup - Why is it so Important?

There’s something that is often overlooked in email marketing. Can you guess what it is? If you said IP warmup, you’re right! You may have guessed it because of the title of this post, or because a...

Shahnawaz Mohammed
November 15th, 2024

Gmail Deliverability Issues: Why Your Emails Go to Spam (And How to Fix It)

1.5 billion people use Gmail every month, and 5 million paying businesses use Gmail in the workplace as a part of G Suite.

Shahnawaz Mohammed
October 31st, 2024

5 Tips to Monitor and Improve Your Domain Reputation

Have you ever wondered why some of your emails never reach your subscribers' inboxes?

Shahnawaz Mohammed
October 30th, 2024

How to Remove Your Email from Blacklists

Email marketing demands precision and expertise, particularly when navigating the complexities of deliverability about your emails ending up in the dreaded blacklist. This challenge confronts marke...

Shahnawaz Mohammed
October 30th, 2024

7 Reasons Why Your Emails Are Going To Spam (With Solutions)

Email marketing is a powerful tool for businesses and entrepreneurs. But there's a big problem: many of your emails might be ending up in the spam folder instead of the inbox.

Saitej Makhijani
October 4th, 2024

6 Common Reasons Why Email Authentication Fails

Did you know that one of the top reasons for emails going to spam is that email authentication fails?

Shahnawaz Mohammed
September 26th, 2024

Comprehensive Guide to Avoiding Spam Trigger Words

Ensuring that your emails reach the inbox without being flagged as spam is crucial. Spam filters have evolved beyond simply catching certain keywords; they now use complex algorithms that analyze e...

Saitej Makhijani
September 23rd, 2024

Gmail’s New Bulk Sender Guidelines - All You Need to Know

Do you often find yourself hitting the 'send' button on bulk email campaigns, hoping to capture the attention of your audience?

Profile icon with white
NW marketing
April 8th, 2024

Exploring Email Bounce Rate Benchmarks in Marketing

The email bounce rate remains a perpetual concern for professionals in the marketing domain. Unlike other metrics, gauging email deliverability poses a slightly intricate challenge, making it tough...

Shahnawaz Mohammed
March 7th, 2024